Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1013 insertions, 0 deletions

diff --git a/drivers/usb/phy/phy-ab8500-usb.c b/drivers/usb/phy/phy-ab8500-usb.c
new file mode 100644
index 000000000..4c52ba96f
--- /dev/null
+++ b/drivers/usb/phy/phy-ab8500-usb.c
@@ -0,0 +1,1013 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * USB transceiver driver for AB8500 family chips
+ *
+ * Copyright (C) 2010-2013 ST-Ericsson AB
+ * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
+ * Avinash Kumar <avinash.kumar@stericsson.com>
+ * Thirupathi Chippakurthy <thirupathi.chippakurthy@stericsson.com>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/usb/otg.h>
+#include <linux/slab.h>
+#include <linux/notifier.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/abx500/ab8500.h>
+#include <linux/usb/musb-ux500.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pinctrl/consumer.h>
+
+/* Bank AB8500_SYS_CTRL2_BLOCK */
+#define AB8500_MAIN_WD_CTRL_REG 0x01
+
+/* Bank AB8500_USB */
+#define AB8500_USB_LINE_STAT_REG 0x80
+#define AB8505_USB_LINE_STAT_REG 0x94
+#define AB8500_USB_PHY_CTRL_REG 0x8A
+
+/* Bank AB8500_DEVELOPMENT */
+#define AB8500_BANK12_ACCESS 0x00
+
+/* Bank AB8500_DEBUG */
+#define AB8500_USB_PHY_TUNE1 0x05
+#define AB8500_USB_PHY_TUNE2 0x06
+#define AB8500_USB_PHY_TUNE3 0x07
+
+/* Bank AB8500_INTERRUPT */
+#define AB8500_IT_SOURCE2_REG 0x01
+
+#define AB8500_BIT_OTG_STAT_ID (1 << 0)
+#define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
+#define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
+#define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
+#define AB8500_BIT_WD_CTRL_KICK (1 << 1)
+#define AB8500_BIT_SOURCE2_VBUSDET (1 << 7)
+
+#define AB8500_WD_KICK_DELAY_US 100 /* usec */
+#define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
+#define AB8500_V20_31952_DISABLE_DELAY_US 100 /* usec */
+
+/* Usb line status register */
+enum ab8500_usb_link_status {
+	USB_LINK_NOT_CONFIGURED_8500 = 0,
+	USB_LINK_STD_HOST_NC_8500,
+	USB_LINK_STD_HOST_C_NS_8500,
+	USB_LINK_STD_HOST_C_S_8500,
+	USB_LINK_HOST_CHG_NM_8500,
+	USB_LINK_HOST_CHG_HS_8500,
+	USB_LINK_HOST_CHG_HS_CHIRP_8500,
+	USB_LINK_DEDICATED_CHG_8500,
+	USB_LINK_ACA_RID_A_8500,
+	USB_LINK_ACA_RID_B_8500,
+	USB_LINK_ACA_RID_C_NM_8500,
+	USB_LINK_ACA_RID_C_HS_8500,
+	USB_LINK_ACA_RID_C_HS_CHIRP_8500,
+	USB_LINK_HM_IDGND_8500,
+	USB_LINK_RESERVED_8500,
+	USB_LINK_NOT_VALID_LINK_8500,
+};
+
+enum ab8505_usb_link_status {
+	USB_LINK_NOT_CONFIGURED_8505 = 0,
+	USB_LINK_STD_HOST_NC_8505,
+	USB_LINK_STD_HOST_C_NS_8505,
+	USB_LINK_STD_HOST_C_S_8505,
+	USB_LINK_CDP_8505,
+	USB_LINK_RESERVED0_8505,
+	USB_LINK_RESERVED1_8505,
+	USB_LINK_DEDICATED_CHG_8505,
+	USB_LINK_ACA_RID_A_8505,
+	USB_LINK_ACA_RID_B_8505,
+	USB_LINK_ACA_RID_C_NM_8505,
+	USB_LINK_RESERVED2_8505,
+	USB_LINK_RESERVED3_8505,
+	USB_LINK_HM_IDGND_8505,
+	USB_LINK_CHARGERPORT_NOT_OK_8505,
+	USB_LINK_CHARGER_DM_HIGH_8505,
+	USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8505,
+	USB_LINK_STD_UPSTREAM_NO_IDGNG_NO_VBUS_8505,
+	USB_LINK_STD_UPSTREAM_8505,
+	USB_LINK_CHARGER_SE1_8505,
+	USB_LINK_CARKIT_CHGR_1_8505,
+	USB_LINK_CARKIT_CHGR_2_8505,
+	USB_LINK_ACA_DOCK_CHGR_8505,
+	USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8505,
+	USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8505,
+	USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505,
+	USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505,
+	USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8505,
+};
+
+enum ab8500_usb_mode {
+	USB_IDLE = 0,
+	USB_PERIPHERAL,
+	USB_HOST,
+	USB_DEDICATED_CHG,
+	USB_UART
+};
+
+/* Register USB_LINK_STATUS interrupt */
+#define AB8500_USB_FLAG_USE_LINK_STATUS_IRQ	(1 << 0)
+/* Register ID_WAKEUP_F interrupt */
+#define AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ	(1 << 1)
+/* Register VBUS_DET_F interrupt */
+#define AB8500_USB_FLAG_USE_VBUS_DET_IRQ	(1 << 2)
+/* Driver is using the ab-iddet driver*/
+#define AB8500_USB_FLAG_USE_AB_IDDET		(1 << 3)
+/* Enable setting regulators voltage */
+#define AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE	(1 << 4)
+
+struct ab8500_usb {
+	struct usb_phy phy;
+	struct device *dev;
+	struct ab8500 *ab8500;
+	unsigned vbus_draw;
+	struct work_struct phy_dis_work;
+	enum ab8500_usb_mode mode;
+	struct clk *sysclk;
+	struct regulator *v_ape;
+	struct regulator *v_musb;
+	struct regulator *v_ulpi;
+	int saved_v_ulpi;
+	int previous_link_status_state;
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *pins_sleep;
+	bool enabled_charging_detection;
+	unsigned int flags;
+};
+
+static inline struct ab8500_usb *phy_to_ab(struct usb_phy *x)
+{
+	return container_of(x, struct ab8500_usb, phy);
+}
+
+static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
+{
+	abx500_set_register_interruptible(ab->dev,
+		AB8500_SYS_CTRL2_BLOCK,
+		AB8500_MAIN_WD_CTRL_REG,
+		AB8500_BIT_WD_CTRL_ENABLE);
+
+	udelay(AB8500_WD_KICK_DELAY_US);
+
+	abx500_set_register_interruptible(ab->dev,
+		AB8500_SYS_CTRL2_BLOCK,
+		AB8500_MAIN_WD_CTRL_REG,
+		(AB8500_BIT_WD_CTRL_ENABLE
+		| AB8500_BIT_WD_CTRL_KICK));
+
+	udelay(AB8500_WD_V11_DISABLE_DELAY_US);
+
+	abx500_set_register_interruptible(ab->dev,
+		AB8500_SYS_CTRL2_BLOCK,
+		AB8500_MAIN_WD_CTRL_REG,
+		0);
+}
+
+static void ab8500_usb_regulator_enable(struct ab8500_usb *ab)
+{
+	int ret, volt;
+
+	ret = regulator_enable(ab->v_ape);
+	if (ret)
+		dev_err(ab->dev, "Failed to enable v-ape\n");
+
+	if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
+		ab->saved_v_ulpi = regulator_get_voltage(ab->v_ulpi);
+		if (ab->saved_v_ulpi < 0)
+			dev_err(ab->dev, "Failed to get v_ulpi voltage\n");
+
+		ret = regulator_set_voltage(ab->v_ulpi, 1300000, 1350000);
+		if (ret < 0)
+			dev_err(ab->dev, "Failed to set the Vintcore to 1.3V, ret=%d\n",
+					ret);
+
+		ret = regulator_set_load(ab->v_ulpi, 28000);
+		if (ret < 0)
+			dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
+					ret);
+	}
+
+	ret = regulator_enable(ab->v_ulpi);
+	if (ret)
+		dev_err(ab->dev, "Failed to enable vddulpivio18\n");
+
+	if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
+		volt = regulator_get_voltage(ab->v_ulpi);
+		if ((volt != 1300000) && (volt != 1350000))
+			dev_err(ab->dev, "Vintcore is not set to 1.3V volt=%d\n",
+					volt);
+	}
+
+	ret = regulator_enable(ab->v_musb);
+	if (ret)
+		dev_err(ab->dev, "Failed to enable musb_1v8\n");
+}
+
+static void ab8500_usb_regulator_disable(struct ab8500_usb *ab)
+{
+	int ret;
+
+	regulator_disable(ab->v_musb);
+
+	regulator_disable(ab->v_ulpi);
+
+	/* USB is not the only consumer of Vintcore, restore old settings */
+	if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
+		if (ab->saved_v_ulpi > 0) {
+			ret = regulator_set_voltage(ab->v_ulpi,
+					ab->saved_v_ulpi, ab->saved_v_ulpi);
+			if (ret < 0)
+				dev_err(ab->dev, "Failed to set the Vintcore to %duV, ret=%d\n",
+						ab->saved_v_ulpi, ret);
+		}
+
+		ret = regulator_set_load(ab->v_ulpi, 0);
+		if (ret < 0)
+			dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
+					ret);
+	}
+
+	regulator_disable(ab->v_ape);
+}
+
+static void ab8500_usb_wd_linkstatus(struct ab8500_usb *ab, u8 bit)
+{
+	/* Workaround for v2.0 bug # 31952 */
+	if (is_ab8500_2p0(ab->ab8500)) {
+		abx500_mask_and_set_register_interruptible(ab->dev,
+				AB8500_USB, AB8500_USB_PHY_CTRL_REG,
+				bit, bit);
+		udelay(AB8500_V20_31952_DISABLE_DELAY_US);
+	}
+}
+
+static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host)
+{
+	u8 bit;
+	bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
+		AB8500_BIT_PHY_CTRL_DEVICE_EN;
+
+	/* mux and configure USB pins to DEFAULT state */
+	ab->pinctrl = pinctrl_get_select(ab->dev, PINCTRL_STATE_DEFAULT);
+	if (IS_ERR(ab->pinctrl))
+		dev_err(ab->dev, "could not get/set default pinstate\n");
+
+	if (clk_prepare_enable(ab->sysclk))
+		dev_err(ab->dev, "can't prepare/enable clock\n");
+
+	ab8500_usb_regulator_enable(ab);
+
+	abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
+			bit, bit);
+}
+
+static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
+{
+	u8 bit;
+	bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
+		AB8500_BIT_PHY_CTRL_DEVICE_EN;
+
+	ab8500_usb_wd_linkstatus(ab, bit);
+
+	abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
+			bit, 0);
+
+	/* Needed to disable the phy.*/
+	ab8500_usb_wd_workaround(ab);
+
+	clk_disable_unprepare(ab->sysclk);
+
+	ab8500_usb_regulator_disable(ab);
+
+	if (!IS_ERR(ab->pinctrl)) {
+		/* configure USB pins to SLEEP state */
+		ab->pins_sleep = pinctrl_lookup_state(ab->pinctrl,
+				PINCTRL_STATE_SLEEP);
+
+		if (IS_ERR(ab->pins_sleep))
+			dev_dbg(ab->dev, "could not get sleep pinstate\n");
+		else if (pinctrl_select_state(ab->pinctrl, ab->pins_sleep))
+			dev_err(ab->dev, "could not set pins to sleep state\n");
+
+		/*
+		 * as USB pins are shared with iddet, release them to allow
+		 * iddet to request them
+		 */
+		pinctrl_put(ab->pinctrl);
+	}
+}
+
+#define ab8500_usb_host_phy_en(ab)	ab8500_usb_phy_enable(ab, true)
+#define ab8500_usb_host_phy_dis(ab)	ab8500_usb_phy_disable(ab, true)
+#define ab8500_usb_peri_phy_en(ab)	ab8500_usb_phy_enable(ab, false)
+#define ab8500_usb_peri_phy_dis(ab)	ab8500_usb_phy_disable(ab, false)
+
+static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
+		enum ab8505_usb_link_status lsts)
+{
+	enum ux500_musb_vbus_id_status event = 0;
+
+	dev_dbg(ab->dev, "ab8505_usb_link_status_update %d\n", lsts);
+
+	/*
+	 * Spurious link_status interrupts are seen at the time of
+	 * disconnection of a device in RIDA state
+	 */
+	if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8505 &&
+			(lsts == USB_LINK_STD_HOST_NC_8505))
+		return 0;
+
+	ab->previous_link_status_state = lsts;
+
+	switch (lsts) {
+	case USB_LINK_ACA_RID_B_8505:
+		event = UX500_MUSB_RIDB;
+		fallthrough;
+	case USB_LINK_NOT_CONFIGURED_8505:
+	case USB_LINK_RESERVED0_8505:
+	case USB_LINK_RESERVED1_8505:
+	case USB_LINK_RESERVED2_8505:
+	case USB_LINK_RESERVED3_8505:
+		ab->mode = USB_IDLE;
+		ab->phy.otg->default_a = false;
+		ab->vbus_draw = 0;
+		if (event != UX500_MUSB_RIDB)
+			event = UX500_MUSB_NONE;
+		/*
+		 * Fallback to default B_IDLE as nothing
+		 * is connected
+		 */
+		ab->phy.otg->state = OTG_STATE_B_IDLE;
+		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
+		break;
+
+	case USB_LINK_ACA_RID_C_NM_8505:
+		event = UX500_MUSB_RIDC;
+		fallthrough;
+	case USB_LINK_STD_HOST_NC_8505:
+	case USB_LINK_STD_HOST_C_NS_8505:
+	case USB_LINK_STD_HOST_C_S_8505:
+	case USB_LINK_CDP_8505:
+		if (ab->mode == USB_IDLE) {
+			ab->mode = USB_PERIPHERAL;
+			ab8500_usb_peri_phy_en(ab);
+			atomic_notifier_call_chain(&ab->phy.notifier,
+					UX500_MUSB_PREPARE, &ab->vbus_draw);
+			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
+		}
+		if (event != UX500_MUSB_RIDC)
+			event = UX500_MUSB_VBUS;
+		break;
+
+	case USB_LINK_ACA_RID_A_8505:
+	case USB_LINK_ACA_DOCK_CHGR_8505:
+		event = UX500_MUSB_RIDA;
+		fallthrough;
+	case USB_LINK_HM_IDGND_8505:
+		if (ab->mode == USB_IDLE) {
+			ab->mode = USB_HOST;
+			ab8500_usb_host_phy_en(ab);
+			atomic_notifier_call_chain(&ab->phy.notifier,
+					UX500_MUSB_PREPARE, &ab->vbus_draw);
+		}
+		ab->phy.otg->default_a = true;
+		if (event != UX500_MUSB_RIDA)
+			event = UX500_MUSB_ID;
+		atomic_notifier_call_chain(&ab->phy.notifier,
+				event, &ab->vbus_draw);
+		break;
+
+	case USB_LINK_DEDICATED_CHG_8505:
+		ab->mode = USB_DEDICATED_CHG;
+		event = UX500_MUSB_CHARGER;
+		atomic_notifier_call_chain(&ab->phy.notifier,
+				event, &ab->vbus_draw);
+		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
+		break;
+
+	/*
+	 * FIXME: For now we rely on the boot firmware to set up the necessary
+	 * PHY/pin configuration for UART mode.
+	 *
+	 * AB8505 does not seem to report any status change for UART cables,
+	 * possibly because it cannot detect them autonomously.
+	 * We may need to measure the ID resistance manually to reliably
+	 * detect UART cables after bootup.
+	 */
+	case USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505:
+	case USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505:
+		if (ab->mode == USB_IDLE) {
+			ab->mode = USB_UART;
+			ab8500_usb_peri_phy_en(ab);
+		}
+
+		break;
+
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
+		enum ab8500_usb_link_status lsts)
+{
+	enum ux500_musb_vbus_id_status event = 0;
+
+	dev_dbg(ab->dev, "ab8500_usb_link_status_update %d\n", lsts);
+
+	/*
+	 * Spurious link_status interrupts are seen in case of a
+	 * disconnection of a device in IDGND and RIDA stage
+	 */
+	if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8500 &&
+			(lsts == USB_LINK_STD_HOST_C_NS_8500 ||
+			 lsts == USB_LINK_STD_HOST_NC_8500))
+		return 0;
+
+	if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8500 &&
+			lsts == USB_LINK_STD_HOST_NC_8500)
+		return 0;
+
+	ab->previous_link_status_state = lsts;
+
+	switch (lsts) {
+	case USB_LINK_ACA_RID_B_8500:
+		event = UX500_MUSB_RIDB;
+		fallthrough;
+	case USB_LINK_NOT_CONFIGURED_8500:
+	case USB_LINK_NOT_VALID_LINK_8500:
+		ab->mode = USB_IDLE;
+		ab->phy.otg->default_a = false;
+		ab->vbus_draw = 0;
+		if (event != UX500_MUSB_RIDB)
+			event = UX500_MUSB_NONE;
+		/* Fallback to default B_IDLE as nothing is connected */
+		ab->phy.otg->state = OTG_STATE_B_IDLE;
+		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
+		break;
+
+	case USB_LINK_ACA_RID_C_NM_8500:
+	case USB_LINK_ACA_RID_C_HS_8500:
+	case USB_LINK_ACA_RID_C_HS_CHIRP_8500:
+		event = UX500_MUSB_RIDC;
+		fallthrough;
+	case USB_LINK_STD_HOST_NC_8500:
+	case USB_LINK_STD_HOST_C_NS_8500:
+	case USB_LINK_STD_HOST_C_S_8500:
+	case USB_LINK_HOST_CHG_NM_8500:
+	case USB_LINK_HOST_CHG_HS_8500:
+	case USB_LINK_HOST_CHG_HS_CHIRP_8500:
+		if (ab->mode == USB_IDLE) {
+			ab->mode = USB_PERIPHERAL;
+			ab8500_usb_peri_phy_en(ab);
+			atomic_notifier_call_chain(&ab->phy.notifier,
+					UX500_MUSB_PREPARE, &ab->vbus_draw);
+			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
+		}
+		if (event != UX500_MUSB_RIDC)
+			event = UX500_MUSB_VBUS;
+		break;
+
+	case USB_LINK_ACA_RID_A_8500:
+		event = UX500_MUSB_RIDA;
+		fallthrough;
+	case USB_LINK_HM_IDGND_8500:
+		if (ab->mode == USB_IDLE) {
+			ab->mode = USB_HOST;
+			ab8500_usb_host_phy_en(ab);
+			atomic_notifier_call_chain(&ab->phy.notifier,
+					UX500_MUSB_PREPARE, &ab->vbus_draw);
+		}
+		ab->phy.otg->default_a = true;
+		if (event != UX500_MUSB_RIDA)
+			event = UX500_MUSB_ID;
+		atomic_notifier_call_chain(&ab->phy.notifier,
+				event, &ab->vbus_draw);
+		break;
+
+	case USB_LINK_DEDICATED_CHG_8500:
+		ab->mode = USB_DEDICATED_CHG;
+		event = UX500_MUSB_CHARGER;
+		atomic_notifier_call_chain(&ab->phy.notifier,
+				event, &ab->vbus_draw);
+		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
+		break;
+
+	case USB_LINK_RESERVED_8500:
+		break;
+	}
+
+	return 0;
+}
+
+/*
+ * Connection Sequence:
+ *   1. Link Status Interrupt
+ *   2. Enable AB clock
+ *   3. Enable AB regulators
+ *   4. Enable USB phy
+ *   5. Reset the musb controller
+ *   6. Switch the ULPI GPIO pins to function mode
+ *   7. Enable the musb Peripheral5 clock
+ *   8. Restore MUSB context
+ */
+static int abx500_usb_link_status_update(struct ab8500_usb *ab)
+{
+	u8 reg;
+	int ret = 0;
+
+	if (is_ab8500(ab->ab8500)) {
+		enum ab8500_usb_link_status lsts;
+
+		ret = abx500_get_register_interruptible(ab->dev,
+				AB8500_USB, AB8500_USB_LINE_STAT_REG, &reg);
+		if (ret < 0)
+			return ret;
+		lsts = (reg >> 3) & 0x0F;
+		ret = ab8500_usb_link_status_update(ab, lsts);
+	} else if (is_ab8505(ab->ab8500)) {
+		enum ab8505_usb_link_status lsts;
+
+		ret = abx500_get_register_interruptible(ab->dev,
+				AB8500_USB, AB8505_USB_LINE_STAT_REG, &reg);
+		if (ret < 0)
+			return ret;
+		lsts = (reg >> 3) & 0x1F;
+		ret = ab8505_usb_link_status_update(ab, lsts);
+	}
+
+	return ret;
+}
+
+/*
+ * Disconnection Sequence:
+ *   1. Disconnect Interrupt
+ *   2. Disable regulators
+ *   3. Disable AB clock
+ *   4. Disable the Phy
+ *   5. Link Status Interrupt
+ *   6. Disable Musb Clock
+ */
+static irqreturn_t ab8500_usb_disconnect_irq(int irq, void *data)
+{
+	struct ab8500_usb *ab = (struct ab8500_usb *) data;
+	enum usb_phy_events event = USB_EVENT_NONE;
+
+	/* Link status will not be updated till phy is disabled. */
+	if (ab->mode == USB_HOST) {
+		ab->phy.otg->default_a = false;
+		ab->vbus_draw = 0;
+		atomic_notifier_call_chain(&ab->phy.notifier,
+				event, &ab->vbus_draw);
+		ab8500_usb_host_phy_dis(ab);
+		ab->mode = USB_IDLE;
+	}
+
+	if (ab->mode == USB_PERIPHERAL) {
+		atomic_notifier_call_chain(&ab->phy.notifier,
+				event, &ab->vbus_draw);
+		ab8500_usb_peri_phy_dis(ab);
+		atomic_notifier_call_chain(&ab->phy.notifier,
+				UX500_MUSB_CLEAN, &ab->vbus_draw);
+		ab->mode = USB_IDLE;
+		ab->phy.otg->default_a = false;
+		ab->vbus_draw = 0;
+	}
+
+	if (ab->mode == USB_UART) {
+		ab8500_usb_peri_phy_dis(ab);
+		ab->mode = USB_IDLE;
+	}
+
+	if (is_ab8500_2p0(ab->ab8500)) {
+		if (ab->mode == USB_DEDICATED_CHG) {
+			ab8500_usb_wd_linkstatus(ab,
+					AB8500_BIT_PHY_CTRL_DEVICE_EN);
+			abx500_mask_and_set_register_interruptible(ab->dev,
+					AB8500_USB, AB8500_USB_PHY_CTRL_REG,
+					AB8500_BIT_PHY_CTRL_DEVICE_EN, 0);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ab8500_usb_link_status_irq(int irq, void *data)
+{
+	struct ab8500_usb *ab = (struct ab8500_usb *)data;
+
+	abx500_usb_link_status_update(ab);
+
+	return IRQ_HANDLED;
+}
+
+static void ab8500_usb_phy_disable_work(struct work_struct *work)
+{
+	struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
+						phy_dis_work);
+
+	if (!ab->phy.otg->host)
+		ab8500_usb_host_phy_dis(ab);
+
+	if (!ab->phy.otg->gadget)
+		ab8500_usb_peri_phy_dis(ab);
+}
+
+static int ab8500_usb_set_suspend(struct usb_phy *x, int suspend)
+{
+	/* TODO */
+	return 0;
+}
+
+static int ab8500_usb_set_peripheral(struct usb_otg *otg,
+					struct usb_gadget *gadget)
+{
+	struct ab8500_usb *ab;
+
+	if (!otg)
+		return -ENODEV;
+
+	ab = phy_to_ab(otg->usb_phy);
+
+	ab->phy.otg->gadget = gadget;
+
+	/* Some drivers call this function in atomic context.
+	 * Do not update ab8500 registers directly till this
+	 * is fixed.
+	 */
+
+	if ((ab->mode != USB_IDLE) && !gadget) {
+		ab->mode = USB_IDLE;
+		schedule_work(&ab->phy_dis_work);
+	}
+
+	return 0;
+}
+
+static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
+{
+	struct ab8500_usb *ab;
+
+	if (!otg)
+		return -ENODEV;
+
+	ab = phy_to_ab(otg->usb_phy);
+
+	ab->phy.otg->host = host;
+
+	/* Some drivers call this function in atomic context.
+	 * Do not update ab8500 registers directly till this
+	 * is fixed.
+	 */
+
+	if ((ab->mode != USB_IDLE) && !host) {
+		ab->mode = USB_IDLE;
+		schedule_work(&ab->phy_dis_work);
+	}
+
+	return 0;
+}
+
+static void ab8500_usb_restart_phy(struct ab8500_usb *ab)
+{
+	abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
+			AB8500_BIT_PHY_CTRL_DEVICE_EN,
+			AB8500_BIT_PHY_CTRL_DEVICE_EN);
+
+	udelay(100);
+
+	abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
+			AB8500_BIT_PHY_CTRL_DEVICE_EN,
+			0);
+
+	abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
+			AB8500_BIT_PHY_CTRL_HOST_EN,
+			AB8500_BIT_PHY_CTRL_HOST_EN);
+
+	udelay(100);
+
+	abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_USB, AB8500_USB_PHY_CTRL_REG,
+			AB8500_BIT_PHY_CTRL_HOST_EN,
+			0);
+}
+
+static int ab8500_usb_regulator_get(struct ab8500_usb *ab)
+{
+	int err;
+
+	ab->v_ape = devm_regulator_get(ab->dev, "v-ape");
+	if (IS_ERR(ab->v_ape)) {
+		dev_err(ab->dev, "Could not get v-ape supply\n");
+		err = PTR_ERR(ab->v_ape);
+		return err;
+	}
+
+	ab->v_ulpi = devm_regulator_get(ab->dev, "vddulpivio18");
+	if (IS_ERR(ab->v_ulpi)) {
+		dev_err(ab->dev, "Could not get vddulpivio18 supply\n");
+		err = PTR_ERR(ab->v_ulpi);
+		return err;
+	}
+
+	ab->v_musb = devm_regulator_get(ab->dev, "musb_1v8");
+	if (IS_ERR(ab->v_musb)) {
+		dev_err(ab->dev, "Could not get musb_1v8 supply\n");
+		err = PTR_ERR(ab->v_musb);
+		return err;
+	}
+
+	return 0;
+}
+
+static int ab8500_usb_irq_setup(struct platform_device *pdev,
+		struct ab8500_usb *ab)
+{
+	int err;
+	int irq;
+
+	if (ab->flags & AB8500_USB_FLAG_USE_LINK_STATUS_IRQ) {
+		irq = platform_get_irq_byname(pdev, "USB_LINK_STATUS");
+		if (irq < 0)
+			return irq;
+		err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+				ab8500_usb_link_status_irq,
+				IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
+				"usb-link-status", ab);
+		if (err < 0) {
+			dev_err(ab->dev, "request_irq failed for link status irq\n");
+			return err;
+		}
+	}
+
+	if (ab->flags & AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ) {
+		irq = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
+		if (irq < 0)
+			return irq;
+		err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+				ab8500_usb_disconnect_irq,
+				IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
+				"usb-id-fall", ab);
+		if (err < 0) {
+			dev_err(ab->dev, "request_irq failed for ID fall irq\n");
+			return err;
+		}
+	}
+
+	if (ab->flags & AB8500_USB_FLAG_USE_VBUS_DET_IRQ) {
+		irq = platform_get_irq_byname(pdev, "VBUS_DET_F");
+		if (irq < 0)
+			return irq;
+		err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+				ab8500_usb_disconnect_irq,
+				IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
+				"usb-vbus-fall", ab);
+		if (err < 0) {
+			dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+static void ab8500_usb_set_ab8500_tuning_values(struct ab8500_usb *ab)
+{
+	int err;
+
+	/* Enable the PBT/Bank 0x12 access */
+	err = abx500_set_register_interruptible(ab->dev,
+			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
+	if (err < 0)
+		dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
+				err);
+
+	err = abx500_set_register_interruptible(ab->dev,
+			AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
+	if (err < 0)
+		dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
+				err);
+
+	err = abx500_set_register_interruptible(ab->dev,
+			AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x00);
+	if (err < 0)
+		dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
+				err);
+
+	err = abx500_set_register_interruptible(ab->dev,
+			AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x78);
+	if (err < 0)
+		dev_err(ab->dev, "Failed to set PHY_TUNE3 register err=%d\n",
+				err);
+
+	/* Switch to normal mode/disable Bank 0x12 access */
+	err = abx500_set_register_interruptible(ab->dev,
+			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
+	if (err < 0)
+		dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
+				err);
+}
+
+static void ab8500_usb_set_ab8505_tuning_values(struct ab8500_usb *ab)
+{
+	int err;
+
+	/* Enable the PBT/Bank 0x12 access */
+	err = abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
+			0x01, 0x01);
+	if (err < 0)
+		dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
+				err);
+
+	err = abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_DEBUG, AB8500_USB_PHY_TUNE1,
+			0xC8, 0xC8);
+	if (err < 0)
+		dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
+				err);
+
+	err = abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_DEBUG, AB8500_USB_PHY_TUNE2,
+			0x60, 0x60);
+	if (err < 0)
+		dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
+				err);
+
+	err = abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_DEBUG, AB8500_USB_PHY_TUNE3,
+			0xFC, 0x80);
+
+	if (err < 0)
+		dev_err(ab->dev, "Failed to set PHY_TUNE3 register err=%d\n",
+				err);
+
+	/* Switch to normal mode/disable Bank 0x12 access */
+	err = abx500_mask_and_set_register_interruptible(ab->dev,
+			AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
+			0x00, 0x00);
+	if (err < 0)
+		dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
+				err);
+}
+
+static int ab8500_usb_probe(struct platform_device *pdev)
+{
+	struct ab8500_usb	*ab;
+	struct ab8500		*ab8500;
+	struct usb_otg		*otg;
+	int err;
+	int rev;
+
+	ab8500 = dev_get_drvdata(pdev->dev.parent);
+	rev = abx500_get_chip_id(&pdev->dev);
+
+	if (is_ab8500_1p1_or_earlier(ab8500)) {
+		dev_err(&pdev->dev, "Unsupported AB8500 chip rev=%d\n", rev);
+		return -ENODEV;
+	}
+
+	ab = devm_kzalloc(&pdev->dev, sizeof(*ab), GFP_KERNEL);
+	if (!ab)
+		return -ENOMEM;
+
+	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
+	if (!otg)
+		return -ENOMEM;
+
+	ab->dev			= &pdev->dev;
+	ab->ab8500		= ab8500;
+	ab->phy.dev		= ab->dev;
+	ab->phy.otg		= otg;
+	ab->phy.label		= "ab8500";
+	ab->phy.set_suspend	= ab8500_usb_set_suspend;
+	ab->phy.otg->state	= OTG_STATE_UNDEFINED;
+
+	otg->usb_phy		= &ab->phy;
+	otg->set_host		= ab8500_usb_set_host;
+	otg->set_peripheral	= ab8500_usb_set_peripheral;
+
+	if (is_ab8500(ab->ab8500)) {
+		ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
+			AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
+			AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
+			AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
+	} else if (is_ab8505(ab->ab8500)) {
+		ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
+			AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
+			AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
+			AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
+	}
+
+	/* Disable regulator voltage setting for AB8500 <= v2.0 */
+	if (is_ab8500_2p0_or_earlier(ab->ab8500))
+		ab->flags &= ~AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
+
+	platform_set_drvdata(pdev, ab);
+
+	/* all: Disable phy when called from set_host and set_peripheral */
+	INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
+
+	err = ab8500_usb_regulator_get(ab);
+	if (err)
+		return err;
+
+	ab->sysclk = devm_clk_get(ab->dev, "sysclk");
+	if (IS_ERR(ab->sysclk)) {
+		dev_err(ab->dev, "Could not get sysclk.\n");
+		return PTR_ERR(ab->sysclk);
+	}
+
+	err = ab8500_usb_irq_setup(pdev, ab);
+	if (err < 0)
+		return err;
+
+	err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2);
+	if (err) {
+		dev_err(&pdev->dev, "Can't register transceiver\n");
+		return err;
+	}
+
+	if (is_ab8500(ab->ab8500) && !is_ab8500_2p0_or_earlier(ab->ab8500))
+		/* Phy tuning values for AB8500 > v2.0 */
+		ab8500_usb_set_ab8500_tuning_values(ab);
+	else if (is_ab8505(ab->ab8500))
+		/* Phy tuning values for AB8505 */
+		ab8500_usb_set_ab8505_tuning_values(ab);
+
+	/* Needed to enable ID detection. */
+	ab8500_usb_wd_workaround(ab);
+
+	/*
+	 * This is required for usb-link-status to work properly when a
+	 * cable is connected at boot time.
+	 */
+	ab8500_usb_restart_phy(ab);
+
+	abx500_usb_link_status_update(ab);
+
+	dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);
+
+	return 0;
+}
+
+static int ab8500_usb_remove(struct platform_device *pdev)
+{
+	struct ab8500_usb *ab = platform_get_drvdata(pdev);
+
+	cancel_work_sync(&ab->phy_dis_work);
+
+	usb_remove_phy(&ab->phy);
+
+	if (ab->mode == USB_HOST)
+		ab8500_usb_host_phy_dis(ab);
+	else if (ab->mode == USB_PERIPHERAL)
+		ab8500_usb_peri_phy_dis(ab);
+
+	return 0;
+}
+
+static const struct platform_device_id ab8500_usb_devtype[] = {
+	{ .name = "ab8500-usb", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, ab8500_usb_devtype);
+
+static struct platform_driver ab8500_usb_driver = {
+	.probe		= ab8500_usb_probe,
+	.remove		= ab8500_usb_remove,
+	.id_table	= ab8500_usb_devtype,
+	.driver		= {
+		.name	= "abx5x0-usb",
+	},
+};
+
+static int __init ab8500_usb_init(void)
+{
+	return platform_driver_register(&ab8500_usb_driver);
+}
+subsys_initcall(ab8500_usb_init);
+
+static void __exit ab8500_usb_exit(void)
+{
+	platform_driver_unregister(&ab8500_usb_driver);
+}
+module_exit(ab8500_usb_exit);
+
+MODULE_AUTHOR("ST-Ericsson AB");
+MODULE_DESCRIPTION("AB8500 family usb transceiver driver");
+MODULE_LICENSE("GPL");